European cell phone provider O2 had a stunning booth at the 2005 CeBIT convention; four years later it remains a striking design.
The ceiling consisted of an undulating grid of 28,000 suspended acrylic rods, each illuminated at the top by video-controlled LED pixels from Element Labs. The effect was extraordinary: Each rod acted as a fiber optic channel, emitting a point of light at the bottom, with just enough emittance along the side to add volume to the ceiling. The physical undulations provided a surface for sweeping, textural patterns of light
While the ceiling piece is impressive, what really makes the booth a success is the inclusion of glowing counters and display platforms, illuminated in neutral white to balance the razzle-dazzle of the ceiling.
A direct link to a Quicktime movie of the stand can be found here.